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基于Python 的語(yǔ)音重采樣函數(shù)解析

更新時(shí)間：2020年07月06日 14:27:11 作者：InterStellar1145

這篇文章主要介紹了基于Python 的語(yǔ)音重采樣函數(shù)解析，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。一起跟隨小編過(guò)來(lái)看看吧

因?yàn)楣ぷ髦袝?huì)經(jīng)常遇到不同采樣率的聲音文件的問(wèn)題，特意寫(xiě)了一下重采樣的程序。

原理就是把采樣點(diǎn)轉(zhuǎn)換到時(shí)間刻度之后再進(jìn)行插值，經(jīng)過(guò)測(cè)試，是沒(méi)有問(wèn)題的。

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time : 17-7-21 下午2:32
# @Author : Lei.Jinggui
# @Site : http://blog.csdn.net/lccever
# @File : Resample.py
# @Software: PyCharm Community Edition
# @contact: lccever@126.com
import numpy as np
def Resample(input_signal,src_fs,tar_fs):
 '''
 :param input_signal:輸入信號(hào)
 :param src_fs:輸入信號(hào)采樣率
 :param tar_fs:輸出信號(hào)采樣率
 :return:輸出信號(hào)
 '''
 dtype = input_signal.dtype
 audio_len = len(input_signal)
 audio_time_max = 1.0*(audio_len-1) / src_fs
 src_time = 1.0 * np.linspace(0,audio_len,audio_len) / src_fs
 tar_time = 1.0 * np.linspace(0,np.int(audio_time_max*tar_fs),np.int(audio_time_max*tar_fs)) / tar_fs
 output_signal = np.interp(tar_time,src_time,input_signal).astype(dtype)
 return output_signal

if __name__ == '__main__':
 import wave
 import pyaudio
 def playSound(audio_data_short, framerate=16000, channels=1):
  preply = pyaudio.PyAudio()
  # 播放聲音
  streamreply = preply.open(format=pyaudio.paInt16,
         channels=channels,
         rate=framerate,
         output=True)
  data = audio_data_short.tostring()
  streamreply.write(data)
  streamreply.close()
  preply.terminate()
 wave_file = 'test.wav'
 audio_file = wave.open(wave_file, 'rb')
 audio_data = audio_file.readframes(audio_file.getnframes())
 audio_data_short = np.fromstring(audio_data, np.short)
 src_fs = audio_file.getframerate()
 src_chanels = audio_file.getnchannels()
 if src_chanels > 1:
  audio_data_short = audio_data_short[::src_chanels]
 tar_fs = np.int(src_fs * 0.5)

 playSound(audio_data_short,framerate=src_fs)
 audio_data_short0 = Resample(audio_data_short,src_fs,tar_fs)
 playSound(audio_data_short0,framerate=tar_fs)

補(bǔ)充知識(shí)：Python 多線程的退出/停止的一種是實(shí)現(xiàn)思路

在使用多線程的過(guò)程中,我們知道,python的線程是沒(méi)有stop/terminate方法的,也就是說(shuō)它被啟動(dòng)后,你無(wú)法再主動(dòng)去退出它,除非主進(jìn)程退出了,注意,是主進(jìn)程,不是線程的父進(jìn)程.

一個(gè)比較合理的方式就是把原因需要放到threading.Thread的target中的線程函數(shù),改寫(xiě)到一個(gè)繼承類(lèi)中,下面是一個(gè)實(shí)現(xiàn)例子

import threading
import time
import os
 
# 原本需要用來(lái)啟動(dòng)的無(wú)線循環(huán)的函數(shù)
def print_thread():
 pid = os.getpid()
 counts = 0
 while True:
  print(f'threading pid: {pid} ran: {counts:04d} s')
  counts += 1
  time.sleep(1)
 
# 把函數(shù)放到改寫(xiě)到類(lèi)的run方法中，便可以通過(guò)調(diào)用類(lèi)方法，實(shí)現(xiàn)線程的終止
class StoppableThread(threading.Thread):
 
 def __init__(self, daemon=None):
  super(StoppableThread, self).__init__(daemon=daemon)
  self.__is_running = True
  self.daemon = daemon
 
 def terminate(self):
  self.__is_running = False
 
 def run(self):
  pid = os.getpid()
  counts = 0
  while self.__is_running:
   print(f'threading running: {pid} ran: {counts:04d} s')
   counts += 1
   time.sleep(1)
 
def call_thread():
 thread = StoppableThread()
 thread.daemon = True
 thread.start()
 
 pid = os.getpid()
 counts = 0
 for i in range(5):
  print(f'0 call threading pid: {pid} ran: {counts:04d} s')
  counts += 2
  time.sleep(2)
 # 主動(dòng)把線程退出
 thread.terminate()
 
if __name__ == '__main__':
 call_thread()
 print(f'==========call_thread finish===========')
 counts = 0
 for i in range(5):
  counts += 1
  time.sleep(1)
  print(f'main thread:{counts:04d} s')

以上這篇基于Python 的語(yǔ)音重采樣函數(shù)解析就是小編分享給大家的全部?jī)?nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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